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Forum:Mercury - Gemini - Apollo
Topic:Earth photos taken on the lunar surface
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HeadshotYes LM-12, your reasoning is correct also. The angle of the Earth's terminator would vary by latitude as well.

It is best to measure the angle of the terminator during half-Earth, when the terminator is a straight line. Despite what that excellent video shows, when the Earth is gibbous there is some subjectivity to determining the terminator angle.

GlintThe angle of the terminator primarily varies by season. The seasons are caused by the earth's axial tilt.
LM-12Frame 9189 is a LM and Earth view from the lunar surface on Apollo 14.

None of the Apollo 15 and Apollo 16 Hasselblad photos taken on the lunar surface seem to show the Earth. That is a surprise. Can you find any?

LM-12I take it from the "superb" Earthrise video that One Big Monkey posted above that (1) the angle of the Earth's axis relative to the lunar horizon changes with latitude and can be used to determine lunar latitude, and (2) the elevation of the Earth above the lunar horizon changes with longitude and can be used to determine lunar longitude.

So, if one can do all the calculations, the (approximate) location where an Earth photo like 20961 was taken can be determined from the photo alone? Amazing.

LM-12The view of Earth in the Apollo 11 emblem is wrong for where they landed. And when they landed also, I believe.
moorouge
quote:
Originally posted by LM-12:
The view of Earth in the Apollo 11 emblem is wrong for where they landed. And when they landed also, I believe.

It also needs to be rotated 90 degrees. I believe Mike Collins has owned up to his astronomical error.

LM-12"... wrong for where they landed" is the 90 degree error.

An Earth view like frame 5924 should be on the emblem: upper half in sunlight with north pole at right. When Apollo 11 landed at 4:17:39 p.m. EDT, the eastern part of North America should have been visible in the sunlit half.

Robert Pearlman
quote:
Originally posted by moorouge:
I believe Mike Collins has owned up to his astronomical error.
From "Carrying the Fire" by Collins:
I added a small earth in the background and drew the sunshine coming from the wrong direction...

LM-12Where would you have to be on the moon and when would you have to be on the moon to see the Earth view in the Apollo 11 patch?

My guess is in the northwest quadrant of the moon near the lunar north pole, on a waning crescent moon.

LM-12The sunlight direction in the Apollo 14 emblem also looks wrong. In the Apollo 8 emblem, the moon is sunlit from the right as seen from the Earth. That seems right for when Apollo 8 flew.

An interesting change in the Apollo 8 emblem would be to switch the positions of the Earth and the moon, and have the moon in the foreground.

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